A friend had his car valued and insured at 50k, but it got stolen and he got 30k which was the nearest match found. So basically insuring at this guaranteed value is balls if there are no other cars at the same value to back it up!

Maybe an insurer will confirm, if you unsure at 50k you get 50k if the worst happens. Or they give you the amount of a similar car, to which why the fook bother doing guaranteed values!